The real problem with stainless hoses is that they don't flex the same. I've installed probably over a dozen sets on different vehicles, but over time they all break off where the stainless ends and the steel fitting starts. The cycling of the suspension causes them to wear at this point. I just installed a 26" rubber hose and two 8" rubber hoses on my rear braking system for less than half the price of a single 26" stainless hose.
That whole sponginess issue is a joke as well, since when you're making the leap from 10 bolts to a Dana 60 and 3/4 ton 10 bolt calipers in the rear, the area of the pistons almost triples. To get rid of that spongey feeling, you have to upgrade your master cylinder. Furthermore, all 4 wheel disc braked vehicles run quite a bit of rubber hose and don't have issues with soft brake pedals.
If abrasion is your concern, run the hoses in an area that they won't get snagged. You're running a false sense of security...